245/45/18 should work fine. if youre worried, get 235/45/18's.
when a 225 wide tire is over 8" wide then i dont see an issue with less than an inch of stretch. i would put 215s on it if i was really trying to tuck.
so what would work best everyone is saying different things like always lol
225 or 235 would be fine
until you see what kind of monster trucking youll do once you upgrade your wheel size. wheel gap is going to be increased and youre going to be pissed...or at least i would be.